Draft software for the calculation of pH in Tris buffers in artificial seawater and other solutions, and carbonate system K* in standard seawater and other natural waters, is now available here: MarChemSpec. It is easy to use, with both user input and results displayed on a single web page. Try it!
The chemical speciation model used in this software yields estimates of the total uncertainties in the calculated quantities, and also the individual contributions of all thermodynamic equilibrium constants and Pitzer ion-interaction coefficients to those totals. We believe this is unique in this type of model, and a valuable research tool.
We will be talking about the model, and demonstrating the software, at the Ocean Sciences meeting in San Diego this month (see the post below). Please join us, if you can.